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The Ultimate Guide to MT6771 IMEI Repair: Causes, Solutions, and Best Tools

6. Troubleshooting "Null" IMEI

If the repair fails or the IMEI returns to "Null" after a reboot:

• NVRAM Issue: The partition might be corrupted. You may need to flash a working nvram.bin file or persist.img (specific to your device model).
• Security Lock: Some brands (like Vivo or Oppo) store IMEI in secure partitions that standard tools cannot touch without authorized accounts.

Prerequisites

1. Windows PC: Windows 7, 8, or 10 (32-bit or 64-bit).
2. Original USB Cable: A high-quality data cable.
3. Device Battery: Ensure the device has at least 30% charge.
4. Driver Installation: You must have MediaTek VCOM Drivers and CDC Drivers installed.
5. Backup: If possible, backup your NVRAM folder (if you have root access) before proceeding.

Troubleshooting Common MT6771 Issues

| Problem | Solution | |---------|----------| | SN Write Tool stuck at “Waiting for phone” | Reinstall VCOM drivers; try different USB port; ensure device is powered off. | | Maui META fails to connect | Enable “USB debugging” and “META mode” in developer options (if available). | | IMEI reverts after reboot | NVRAM is write-protected; format NVRAM first or use SP Flash Tool with “Format All + Download” (⚠️ risky). | | No service after IMEI repair | Check baseband version; reflash modem or ltecfg partition. |

Top 5 MT6771 Phones That Commonly Need IMEI Repair

Based on repair forum data, these MT6771 devices are the most frequent candidates for IMEI repair: Mt6771 Imei Repair

1. Xiaomi Redmi Note 7 / Note 7 Pro – Often loses IMEI after anti-rollback ARB trigger.
2. Ulefone Armor 6 / 7 – NVRAM corruption from Factory mode.
3. Tecno Camon CM / Pova 2 – Poor factory sealing of the NVRAM partition.
4. Realme 3 / 3i – Baseband crashes after Android 10 update.
5. Oukitel WP5 / WP6 – NVRAM wiped after SP Flash Tool misuse.

Method 1: Using Ultimate Multi Tool (UMT) / MRT (Recommended for Brand Names)

This method is used for branded phones (Oppo F11, Vivo Z1x, etc.) where the IMEI is stored in the Modem NVRAM.

What you need:

• UMT MTK Module or MRT Key software.
• A PC with the tool installed.

Procedure:

1. Open the Tool: Launch UMT MTK or MRT software.
2. Select Brand: Choose your phone brand (e.g., OPPO or VIVO).
3. Select Model: Find the specific model number (e.g., CPH1911 for Oppo F11).
   • Note: If your specific model isn't listed, try selecting a generic MT6771 option or "OPPO [MTK] Common".
4. Connect Phone:
   • Power off the phone completely.
   • In the tool, click "Scan/Connect".
   • Connect the phone to the PC via USB (holding Volume Up or Down is usually not required for UMT/MRT as they auto-detect, but if it fails, hold Volume Up).
5. Unlock/Format:
   • The tool will detect the device in BROM mode.
   • Look for the "IMEI Repair" or "Modem Repair" tab.
   • Enter the Original IMEI from the back of your phone box.
6. Execute: Click "Repair/Write".
   • The tool will handle the NVRAM write process automatically.
7. Reboot: Once the process says "Done", disconnect the phone and power it on.
8. Check: Dial *#06# to verify the IMEI.

Method 1: Using SN Write Tool (No Root Required)

Best for: Stock or near-stock firmware with working meta mode. The Ultimate Guide to MT6771 IMEI Repair: Causes,

Steps:

1. Install MediaTek USB VCOM drivers.
2. Open SN Write Tool (run as administrator).
3. Select “Smart Phone” and choose MT6771 from the dropdown.
4. Under IMEI Option, choose “Write IMEI” and enter both IMEI numbers.
5. Power off the device.
6. Click Start in SN Write Tool, then connect the powered-off device via USB.
7. The tool will detect the phone in META mode and write IMEIs automatically.
8. Disconnect and reboot – check *#06#.